Class AB output stages for low voltage CMOS opamps with accurate quiescent current control by means of dynamic biasing

Two new class AB output stages for CMOS op-amps are proposed with accurate quiescent current control. The second proposed stage also provides accurate control of the minimum current through the output transistors. The proposed stages can be operated with a supply voltage close to a transistor threshold voltage. A dynamic biasing scheme allows them to operate in a wide range of supply voltages. Simulation and experimental results are provided that are in good agreement with expected values.